Electric-arc lamp



(No Model.) 4 Sheets-Sheet l.

G. DORIOT.

ELECTRIC ARC LAMP.

No. 344,642. Patented June 29, 1886.

WITNESSEE:

INVENTDF! (No Model.) 4 Sheets-Sheet 2. O. DORIOT.

ELECTRIC ARC LAMP.

No. 344,642. Patented June 29, 1886.

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(No Model.) 4 Sheets-Sheet 3.

G. DORIOT.

ELECTRIC ARO LAMP.

No. 344,642. Patented June 29, 1886.

INVENTEJFI nv PETERS, PhaRo-Lllhognphnr. wa-nm xm, D. a

(No Model.) 4 Sheets-Sheet 4.

- G. DORIOT.

ELECTRIC ARC LAMP.

No. 344,642. I Patented June 29, 1886.

WITNESSES INVENTElF-i N. PETERS PhnXn-Lflhognphnr. Waihingtun. D. c.

UNITED STATES PATENT OFFICE.

CONSTANT DORIOT, OF PHlLADELPHlA, PENNSYLVANIA.

ELECTRIC-ARC LAMP.

SPECIFICATION f rming part of Letters Patent No. 344,642, dated June 29, 1886.

Application filed September 29, 585.

1 State of Pennsylvania, have invented certain lGW and useful Improvements in Electric-Arc Lamps; and [do hereby declare the following to be a full, clear, and exact description of the invention, reference being bad to the accompanying drawings, which form part of this specification, in which- Figure 1 is a side elevation of lamp. Fig. 2 is an elevation of feed-roller and shaft enlarged; and Fig. 3 is a detail, enlarged, of feed-rollers and supports. Fig. 4 is a plan of lamp below the top frarneplate. Fig. 5 is a side view of the lower-carbon-feeding devices. Fig. 6 is an elevation of the opposite side of the same. Fig. 7 is a sectional view of a detail. Fig. 8 is a perspective view of detail.

hjly invention has for its primary object to provide a positive feed for electric-arc lamps.

My invention consists in the peculiar eonstruction and combinations of parts, hereinafter fully described, having reference particularly to the following points: first, to the combination, with the feed-magnet of an arc lamp, of two grooved rollers, inter-meshing gearwheels on the shafts of both rollers, and a pawl and ratchet, said rollers being adapted and designed to clamp a carbon pencil or its holder and to feed the same, as hereinafter set forth; second, to the combination, with the feed-magnet of an arc-lamp and its armatures, of a lever carrying a pawl and having a retracting-spring, a ratchet with which said pawl engages, two grooved and serrated or milled rollers, intermeshing gears on the shafts of said rollers, brackets or blocks in which said shafts have their bearings,and springs whereby said rollers are forced toward each other, so as to tightly clampacarbon pencil or holder between them and to feed the same, substantially as hereinafter fully set forth; third, to the combination, in an arc lamp, of a feedingmagnet in a short circuit, and a switch for cutting out said magnet as soon as it effects the attraction of its armature orproduces a step of the feed motion, substantially as hereinafter fully set forth; fourth, to certain details of construction and combination, hereinafter fully set forth.

Serial No. H8524. (No model.)

Referring to the accompanying drawings, A represents the frame of the lamp, which may be of any usual or suitable construction, to enable the lamp to stand on a base or pedestal, or to hang vertically, or with its carbon horizontal, the feed being adapted to operate either up or down or horizontally.

B is a low-resistance magnet in the main circuit, and O a high-resistance magnet in a shunt-circuit.

O is the armature of magnet O, and it is fastened by an insulated piece, 0, to alcver, D, the latter being pivotally attached at one'end, d, to the feed; frame, hereinafter described. Said lever carries at its opposite end a pawl, d, which engages with a ratchet, E, and ithas a retractingsprin (F. The circuit to the feed-magnet O is made through two contactpins, ff, fastened in the insulating-heads c of said magnet. A spring, lever, or switch, F, having an insulated tail-piece, f makes electric connections between said pins, and when said lever is raised from pinf, such connection is broken. A spring on the fulcrum f of said lever normally holds latter in contact with pinf.

The lever 1) has a lateral arm, d", with adjustable screw-stud d, that meets and presses the tail-piece f when said lever is moved toward the magnet O. The magnet O is thereupon de-energized, releasing armature O and permitting lever D to be retracted by spring d causing pawl d to slip back over a tooth or two or more teeth of ratchet E. The extent .Of retraction (and therefore of length of feed) may be adjusted by means of a set-screw, g, fitted in a stationary bracket, arm, or projection, (Z extending from a frame, K, and limiting the vibration of lever I).

On the shaft E of ratchet E is agear-wheel, h, which meshes with a similar gear-wheel, i, on a shaft, 1, said shafts having bearings in slots in the sides 7c is of a frame, K. These shafts E and lcarry grooved rollersl Z,wh0se peripheries are corrugated or milled, so as to enable them to secure a good bite on the carbon pencil or its holder placed between them. L shows a carbon-holder consisting of a tube with a rack-like or threaded surface with which the rollers Z Z engage. The holderL fits snugly, and may be freely moved lengthwise in another tube, M, which has hearings in the ends or heads A A of frame A, itssides being slotl ted at m m, to permit contact of rollers ll with the holder L, or with a carbon pencil if said holder be dispensed with. The frame or box K is secured to the tube M, as is also the armature B of magnet B. A retractingspring, N, encircling tube M and pressing against a collar, m, thereon, as shown in Fig. 6, or directly against armature B, as shown in Fig. 3, serves to push back armature B when magnet B is not energized, the frame K, tube M, and the feeding mechanism carried thereon moving therewith.

The shafts E I are supported in pillow-blocks O O, which fit in the frame K, and have stems 0" 0 which fit in openings in springs 0 0 that bear against these blocks, so as to cause the rollers Z Z to be pressed towardeach other, and give them a clampingaction on the holder L, or on a carbon pencil in place of said holder.

The carbon pencil is the positive electrode of the lamp, the negative electrode being a stationary carbon oriridium point, P. secured in an arm, Q, which is both horizontally or laterally adjustable on a standard or support, B, said arm passing through a coupling, 7", on standard R, and being made fast in any adjusted position by means of a set-screw, r. Carried on the arm Q is a slide, S, to which the point P is directly attached, said slide being movable transverse to the arm Q in a plane parallel with support R, and held in any adjusted position by means of a set-screw, s.

T represents the positive carbon pencil,.

whose point, before the electric current enters the lamp, bears against the iridium point P, being held thereto by the action of spring N, which holds armature B away from the face of its magnet B. The current on entering energizes said magnet B, attracting armature B, and producing a movement of tube M, which I draws carbon Taway from point P and establishes the are.

When the consumption of the carbon makes the resistance of the are greater than that of the shunt-magnet, the current passes by way of the latter, energizing it, causingit to attract its armature and to produce a motion of the grooved rollers in the proper direction to feedthe carbon toward the iridium. As already mentioned, as soon as the feed is effected the shunt-magnet is automatically cut out by the movement of the switch-lev er. The resistance of theshunt-magnet may be so proportioned, and the ratchet movement made so fine, that the feed will be almost imperceptible.

As the feed is positive and not depending upon gravity, the movement of the carbon will be accomplished, no matter what the position of the lamp-i. 6., standing, with the magnets, &c., belowthe carbon, or inverted, or with the carbon horizontal.

The construction described, including the stationary iridium point, is mainly intended for lamps which maintain a stationary focus, but the feed specified is applicable to any lamp having a progressively-moving carbon pencil.

The vertical adjustability of the negative electrode permits the length of the arc to be regulated by this means, and the lateral adjustability of the same secures the presentation to the reflector of whichever side of the are it is desired to present thereto.

The circuit through the lamp is as, follows: Entering at 1 it passes to magnet B, and from latter to positive electrode by connection at 2 with tube M. From positive electrode it passes to negative electrode, and from latter to lamp-frame out at 3. The shunt to resistance-magnetjs from connection 1 by connection 4 to pinf; thence by switch-lever F to pin f, and'from latter to magnet O by connection 5. From magnet G the circuit is by connection 6 to 3. The standard R, which is metallic, rises from a metal ring, A supported upon and insulated from the upper head, A,

and the tube M, where it passes through the heads A A is insulated from said heads by means of collars.

\Vhat I claim as my invention is 1. In an arc-lamp feed mot-ion, the combination of two grooved rollers on separate shafts, two intermeshing wheels on said shafts, a ratchet on one of said shafts, a lever carrying a pawl for said ratchet, and a magnet whose armature is connected to said lever, whereby when said magnet is energized said rollers will be positively turned, substantially as shown and described.

2 The combination, with feed-magnet G and its armature O, of lever D, spring d pawl d, ratchet E, gears h z, rollers Z Z, arm d", spring switch-lever F, and contact-pins f f, whereby the energization of said magnet causes a rotary motion of said rollers, and im mediately thereafter a cutting out of said magnet and a retraction of said lever D, substantially as shown and described.

3. The combination, in an arc lamp, of frame A, main-circuit magnet B, with armature B, shunt-magnet O, with armature G, lever D, having retracting-spring d pawl d and swi'tchoperating arm d, switch-lever F, insulated contacts f f, ratchet E, gears h i, grooved rollers Z 1, box or frame K, and pillowblocks 0 0, having spring-pressers 0 0, said parts being constructed and combined for operation, substantially as shown and described.

In testimony that I claim the foregoing I have hereunto set my hand this 8th day of September, 1885.

CONSTANT DORIOT.

\Vitnesses:

R. .DALE SPARHAWK, M. D. GoNNoLLY.

It is hereby certified that in Letters Patent No. 344,642, granted June 29, 1886, upon the application of Constant Doriot, of Philadelphia, Pennsylvania for an improvement in Electric-Arc Lamps, an error appears in the printed specification requiring the following correction, viz: In line 3, page 1 the patentee is described as a citizen of the United States, whereas he is a citizen of France; and that the Letters Patent should be read with this correction therein to make it conform to the record of the case in the Patent Office.

Signed countersigned, and scaled this 13th day of J nly, A. D. 1886.

[SEAL] D. L. HAWKINS,

' Acting Secretary of the Interior.

Countersigned M. V. MONTGOMERY,

Commissioner of Patents.

Correction in Letters Patent No. 344,642.

It is hereby certified that in Letters Patent N 0. 344,642 granted June 29, 1886, upon the application of Constant Doriot, of Philadelphia, Pennsylvania for an improvement in Electric-Arc Lamps, an error appears in the printed specification requiring the following correction, viz: In line 3, page 1, the patentee is described as a citizen of the United States, Whereas he is a citizen of France; and that the Letters Patent should be read with this correction therein to make it conform to the record of the ease in the Patent Office.

Signed, countersigned, and sealed this 13th day of J nly, A. D. 1886.

[SEAL] D. L. HAWKINS,

' Acting Secretary of the Interior. (Jountersigned M. V. MONTGOMERY,

Commissioner of Patents.

Correction in Letters Patent No. 344,642. 

